DESCRIPTION The atoi() function converts the initial
portion of the string pointed to by nptr to int. The
behavior is the same as

strtol(nptr, (char **) NULL, 10);

except that atoi() does not detect errors.

The atol() and atoll() functions behave the same as
atoi(), except that they convert the initial portion of the
string to their return type of long or long long. atoq() is
an obsolete name for atoll().

RETURN VALUE The converted value.

CONFORMING TO SVr4, POSIX.1-2001, 4.3BSD, C99. C89 and
POSIX.1-1996 include the functions atoi() and atol() only.
atoq() is a GNU extension.

NOTES The non-standard atoq() function is not present in
libc 4.6.27 or glibc 2, but is present in libc5 and libc 4.7
(though only as an inline func- tion in <stdlib.h>
until libc 5.4.44). The atoll() function is present in glibc
2 since version 2.0.2, but not in libc4 or libc5.

SEE ALSO atof(3), strtod(3), strtol(3), strtoul(3)

COLOPHON This page is part of release 3.22 of the Linux
man-pages project. A description of the project, and
information about reporting bugs, can be found at
http://www.kernel.org/doc/man-pages/.